STMicroelectronics 74ALVCH16245TTR

Overview

74ALVCH16245TTR from STMicroelectronics is a low-voltage CMOS 16-bit bus transceiver with 3-state outputs, bidirectional data flow controlled by DIR inputs, 3.6V-tolerant I/O, and bus-hold on all data inputs. It operates from 1.65V to 3.6V, delivers 3.0 ns max propagation delay at 3.0–3.6V, and supports ±24 mA output drive at VCC = 3.0V - ideal for voltage-translating bidirectional bus interfaces in mixed-supply systems.

For engineers reviewing the 74ALVCH16245TTR datasheet, 74ALVCH16245TTR pinout, 74ALVCH16245TTR application, or 74ALVCH16245TTR equivalent, key selection criteria include 3.6V I/O tolerance, symmetrical output drive (|IOH| = IOL), bus-hold functionality eliminating external resistors, and compatibility with 74-series 16245 logic families in TSSOP-48 packaging.

Technical Context

This transceiver implements dual 8-bit bidirectional data paths (Port A ↔ Port B), each independently enabled via dedicated G (output enable) and DIR (direction control) inputs. Data flow direction is determined solely by DIR state: DIR = LOW enables A→B transmission; DIR = HIGH enables B→A transmission.

All 32 I/O pins feature bus-hold circuitry that maintains last-valid logic state when inputs float, and integrated ESD protection ensures >2000V HBM immunity. The device meets JESD17 latch-up specification (>300 mA) and supports hot insertion due to power-down input/output protection.

Key Specifications

Pinout & Package

TSSOP-48 (Thin Shrink Small Outline Package), 12.6 mm × 8.1 mm body, 0.5 mm pitch, lead-free and RoHS-compliant per STMicroelectronics specification.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus transceiver applications.

Compared with SN74ALVCH16245DGGR and 74LVC16245APAG, the 74ALVCH16245TTR offers superior ESD robustness and integrated bus-hold - reducing external components and improving reliability in thermally stressed or noisy environments without sacrificing speed or voltage flexibility.

Availability

74ALVCH16245TTR is available at Aetrix Electronics and suitable for industrial PLC backplanes, low-power FPGA I/O expansion, automotive body control modules, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and mixed-voltage architectures.

Supply support for 74ALVCH16245TTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and analog/mixed-signal devices for industrial, automotive, and consumer markets.

The ALVCH logic family targets high-speed, low-voltage bidirectional bus interfacing in mixed-supply systems - emphasizing voltage translation, noise immunity, and integration of bus-hold and power-down protection without external components.

FAQ

Does the 74ALVCH16245TTR support hot-plug operation?

Yes. Its power-down protection ensures inputs and outputs remain in high-impedance and ESD-protected states even when VCC = 0V, allowing safe insertion/removal in live backplane systems. This behavior is verified per absolute maximum ratings and functional test conditions in the STMicroelectronics datasheet Rev 3 (July 2003).

What is the maximum capacitive load this transceiver can drive reliably?

The device is characterized up to 50 pF load capacitance at VCC = 3.0–3.6V with RL = 500 Ω, delivering 3.0 ns max tPD. Driving >50 pF increases propagation delay and may degrade edge fidelity; for heavier loads, derate timing margins or add series termination per AC electrical characteristics table on page 5 of the datasheet.

How does bus-hold current behave across voltage and temperature?

Bus-hold current varies with VCC and input voltage: at VCC = 3.0V and VI = 2.0V, IIHOLD = –75 µA (sinking); at VCC = 1.65V and VI = 0.58V, IIHOLD = +25 µA (sourcing). Full characterization across –55°C to +125°C is provided in DC specifications Table 4, confirming stable hold strength across industrial temperature range.

Can both DIR and G inputs be tied together for simplified control?

No. DIR controls data direction (A↔B), while G enables/disables outputs (active-low). Tying them violates truth table logic: simultaneous HIGH on G disables outputs regardless of DIR state, breaking bidirectional functionality. Independent control is required for full 16-bit transceiver operation per pin description on page 2 of the datasheet.